• Different ( or Distinct ) from zero ( or Nonzero ).
• The first term not being zero, ...
• Nonvanishing .
• Different ( or Distinct ) from zero ( or Nonzero ).
• The first term not being zero, ...
• Nonvanishing .
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012